Sponges are simple animals that spend most of their lives attached to the ocean floor filtering water to get nutrients. Cnidarians. like anemones, coral, and sea jellies, are similar but are mor mobile and have stinging tentacles to grab food.
SPONGES (phylum Porifera):
narration below 7th grade, but good images and content
Fourteen minutes from the "Shape of Life" series.
CNIDARIANS: anemones, sea jellies, hydra
play from 1:03 to 5:05
14 minutes. From the Shape of Life video series